There is also a VERY small possibility that the issue is the CCFL (cold Cathode Fluorescent bulb) itself as well. Why? Well, it costs you nothing but time, and by doing so, you either discover or eliminate it as the cause. checking to see if the wiring harness is loose or damaged is most definitely part of the diagnostic process. For some people, this manifests in colored vertical lines on their screens that will either show up or even disappear when pressure is put on one corner or another. Over time, opening from one corner puts a twist on the screen and over time, the LCD panel separates from the PCB mounted to the top edge of the screen. Most people open and close their laptop screens from one corner of the lid, rather than from the center. It is more likely that the issue is more expensive. Some will flicker when they are going bad if you tap the bezel at the bottom of the screen though. However, they don't tend to flicker when the screen is moved or opened/closed. You'd know if it was an inverter that was going, because you'd be able to still see what was being displayed if you pointed a flash light at the screen while it was dark. You'd have to remove the bezel around the screen, and most likely remove the LCD panel itself to be able to get at the inverter and remove it from the bracket it is attached to at the bottom of the screen. Replacing a screen inverter is essentially just as complex a job as replacing a wiring harness. I'm not saying it is impossible, just that it has a low probability. They don't work themselves loose over time, as there isn't that kind of tension on them in the way they have been assembled. As has been stated, a loose or damaged screen wiring harness could be the cause of the issue, provided the laptop has suffered some impact.
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